Literary director, Man Booker prizes and COO, Man Group

Formerly a publisher at Weidenfeld (where he edited Alan Clark's diaries), Trewin took over from Martyn Goff – known for covert spinning – as administrator of the Man Booker prize in 2006. Less tricksy and hyperactive than his predecessor, he's introduced the odd modernising touch while aiming to consolidate the £50,000 award's reputation as the "gold standard" of literary prizes. In this he's largely succeeded, although this year's controversial choice of Stella Rimington as chair, with other, similarly populist panellists, might dent both his and the award's image.

Tweedy, bearded and Garrick Club tie-wearing, he now forms a double act of genial English gent and driven New York financier with Roman, a former Goldman Sachs banker who became the number two at the Man Group – the prize's sponsor – when the giant hedge fund acquired GLG Partners (where he was joint chief executive) last year. Known to be bookish, Roman is seen as the company's pointman in developing an involvement that also includes funding the biennial Man Booker International prize, won earlier this year by Philip Roth. There has been speculation that he is intent on launching a Man Booker American prize to take on existing US fiction awards.